CN111770421A - Piezoelectric vibrating diaphragm and piezoelectric loudspeaker - Google Patents
Piezoelectric vibrating diaphragm and piezoelectric loudspeaker Download PDFInfo
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- CN111770421A CN111770421A CN202010618300.1A CN202010618300A CN111770421A CN 111770421 A CN111770421 A CN 111770421A CN 202010618300 A CN202010618300 A CN 202010618300A CN 111770421 A CN111770421 A CN 111770421A
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- 239000000919 ceramic Substances 0.000 claims abstract description 215
- 239000000758 substrate Substances 0.000 claims abstract description 29
- 239000003292 glue Substances 0.000 claims abstract description 12
- 239000002131 composite material Substances 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 6
- 230000005684 electric field Effects 0.000 claims description 20
- 230000010287 polarization Effects 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 230000004044 response Effects 0.000 abstract description 10
- 238000010586 diagram Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R17/00—Piezoelectric transducers; Electrostrictive transducers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/04—Plane diaphragms
- H04R7/06—Plane diaphragms comprising a plurality of sections or layers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
- H04R2307/023—Diaphragms comprising ceramic-like materials, e.g. pure ceramic, glass, boride, nitride, carbide, mica and carbon materials
Abstract
The invention discloses a piezoelectric diaphragm and a piezoelectric loudspeaker, belonging to the technical field of loudspeakers and comprising a substrate; the piezoelectric ceramics are fixed on the substrate through fixing glue, the plurality of piezoelectric ceramics comprise a central piezoelectric ceramic and a plurality of annular piezoelectric ceramics, the plurality of annular piezoelectric ceramics are all annular and arranged around the central piezoelectric ceramic, the plurality of annular piezoelectric ceramics are distributed along the direction of the center pointing to the edge of the substrate, the deformation direction of the annular piezoelectric ceramics adjacent to the central piezoelectric ceramic is opposite to that of the central piezoelectric ceramic, and the deformation directions of two adjacent annular piezoelectric ceramics are opposite; and the composite base material is adhered to the central piezoelectric ceramics and the annular piezoelectric ceramics through conductive glue. The piezoelectric diaphragm and the piezoelectric loudspeaker provided by the invention have better high-frequency performance, are reflected on a frequency response curve, and the frequency response curve can be smoother in a high-frequency band without obvious wave crests and wave troughs.
Description
Technical Field
The invention relates to the technical field of speakers, in particular to a piezoelectric diaphragm and a piezoelectric speaker.
Background
The piezoelectric speaker produces sound based on the inverse piezoelectric effect of the piezoelectric material, has the advantages of being ultra-light, ultra-thin, small in sound cavity and the like, and is widely applied to the field of speakers.
In the prior art, a piezoelectric diaphragm in a piezoelectric speaker generally includes a monolithic piezoelectric ceramic, glue, and a substrate, which are stacked. When a positive voltage is applied to the piezoelectric diaphragm, the whole piece of piezoelectric ceramic stretches, and the piezoelectric diaphragm bends upwards; when negative voltage is applied to the piezoelectric diaphragm, the whole piece of piezoelectric ceramic contracts, and the piezoelectric diaphragm bends downwards; when alternating current is applied to the piezoelectric diaphragm, the whole piece of piezoelectric ceramic can be continuously bent up and down along with the change of voltage so as to push air to produce sound.
However, the piezoelectric speaker in the related art has poor high frequency performance.
Disclosure of Invention
The invention aims to provide a piezoelectric diaphragm and a piezoelectric loudspeaker, which have better high-frequency performance, are reflected on a frequency response curve, can make the frequency response curve smoother in a high-frequency band, and do not have obvious wave crests and wave troughs.
As the conception, the technical scheme adopted by the invention is as follows:
a piezoelectric diaphragm, comprising:
a substrate;
the piezoelectric ceramics are fixed on the substrate through fixing glue, the plurality of piezoelectric ceramics comprise a central piezoelectric ceramic and a plurality of annular piezoelectric ceramics, the plurality of annular piezoelectric ceramics are all annular and arranged around the central piezoelectric ceramic, the plurality of annular piezoelectric ceramics are distributed along the direction of the center pointing to the edge of the substrate, the deformation direction of the annular piezoelectric ceramics adjacent to the central piezoelectric ceramic is opposite to that of the central piezoelectric ceramic, and the deformation directions of two adjacent annular piezoelectric ceramics are opposite;
and the composite base material is adhered to the central piezoelectric ceramics and the annular piezoelectric ceramics through conductive glue.
Optionally, the central piezoelectric ceramic is the same thickness as the plurality of annular piezoelectric ceramics.
Optionally, glue is filled between the central piezoelectric ceramic and the annular piezoelectric ceramic and between two adjacent annular piezoelectric ceramics.
Optionally, the cross-sectional shape of the central piezoelectric ceramic is circular, square, triangular or racetrack.
Optionally, the cross-sectional shapes of a plurality of the annular piezoelectric ceramics are all circular, square, triangular or racetrack.
Optionally, the plurality of annular piezoelectric ceramics include a first annular piezoelectric ceramic having a circular cross section and a second annular piezoelectric ceramic having a square cross section.
Optionally, the piezoelectric ceramic is fixed to one side of the substrate, or the piezoelectric ceramic is disposed on both the upper and lower sides of the substrate.
Optionally, the polarization direction of the annular piezoelectric ceramic adjacent to the central piezoelectric ceramic is opposite to the polarization direction of the central piezoelectric ceramic, and during use of the piezoelectric diaphragm, the direction of an electric field applied to the annular piezoelectric ceramic adjacent to the central piezoelectric ceramic is the same as the direction of an electric field applied to the central piezoelectric ceramic; alternatively, the first and second electrodes may be,
the polarization direction of the annular piezoelectric ceramics adjacent to the central piezoelectric ceramics is the same as that of the central piezoelectric ceramics, and in the use process of the piezoelectric diaphragm, the direction of an electric field applied to the annular piezoelectric ceramics adjacent to the central piezoelectric ceramics is opposite to that applied to the central piezoelectric ceramics.
Optionally, the polarization directions of two adjacent annular piezoelectric ceramics are opposite, and the directions of electric fields applied to the two adjacent annular piezoelectric ceramics are the same in the use process of the piezoelectric diaphragm; or the polarization directions of two adjacent annular piezoelectric ceramics are the same, and the directions of electric fields applied to the two adjacent annular piezoelectric ceramics are opposite in the use process of the piezoelectric diaphragm.
A piezoelectric loudspeaker comprises the piezoelectric diaphragm.
The beneficial effects of the invention at least comprise:
the piezoelectric diaphragm and the piezoelectric loudspeaker provided by the invention have the advantages that the piezoelectric ceramics comprise the central piezoelectric ceramics and the plurality of annular piezoelectric ceramics, the deformation direction of the annular piezoelectric ceramics adjacent to the central piezoelectric ceramics is opposite to that of the central piezoelectric ceramics, the deformation directions of two adjacent annular piezoelectric ceramics are opposite, the acoustic performance of the piezoelectric diaphragm is effectively inhibited compared with that of the traditional piezoelectric diaphragm, the high-frequency mode can be effectively inhibited, the piezoelectric loudspeaker can have better high-frequency performance, the piezoelectric diaphragm is reflected on a frequency response curve, the frequency response curve in a high-frequency section can be smoother, and no obvious wave crest and wave trough exist.
In addition, the resonance frequency of the piezoelectric speaker is not affected, and the sensitivity does not change greatly.
Drawings
Fig. 1 is a top view of a piezoelectric diaphragm according to an embodiment of the present invention;
fig. 2 is a first schematic cross-sectional view of a piezoelectric diaphragm according to an embodiment of the present invention;
fig. 3 is a schematic cross-sectional view of a piezoelectric diaphragm according to an embodiment of the present invention;
FIG. 4 is a schematic view of a piezoelectric diaphragm having a composite substrate shown therein according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a piezoelectric diaphragm according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another piezoelectric diaphragm provided in an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another piezoelectric diaphragm provided in an embodiment of the present invention;
fig. 8 is a schematic structural diagram of another piezoelectric diaphragm according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a piezoelectric diaphragm according to an embodiment of the present invention;
fig. 10 is a diagram illustrating a mode analysis of a piezoelectric diaphragm according to an embodiment of the present invention;
FIG. 11 is a graph of voltage feedback from a ring piezoelectric ceramic adjacent to a center piezoelectric ceramic, according to an embodiment of the present invention.
In the figure:
1. a substrate; 2. piezoelectric ceramics; 21. a central piezoelectric ceramic; 22. an annular piezoelectric ceramic; 221. a first annular piezoelectric ceramic; 222. a second annular piezoelectric ceramic; 3. fixing glue; 4. a composite substrate; 5. a conductive adhesive; 6. and (4) glue.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The embodiment provides a piezoelectric diaphragm which can be applied to a piezoelectric speaker, so that the piezoelectric speaker can have good high-frequency performance.
As shown in fig. 1 to 9, the piezoelectric diaphragm includes a substrate 1, a plurality of piezoelectric ceramics 2, and a composite base material 4 located on a side of the piezoelectric ceramics 2 away from the substrate 1.
The piezoelectric ceramics 2 are fixed on the substrate 1 through the fixing glue 3, the number of the piezoelectric ceramics 2 can be determined according to the requirement, and the number of the piezoelectric ceramics 2 is at least two. As shown in fig. 2, the plurality of piezoelectric ceramics 2 includes a central piezoelectric ceramic 21 and a plurality of annular piezoelectric ceramics 22, and each of the plurality of annular piezoelectric ceramics 22 is annular and disposed around the central piezoelectric ceramic 21. That is, the annular piezoelectric ceramics 22 is located at the outer periphery of the central piezoelectric ceramics 21. And, a plurality of annular piezoelectric ceramics 22 are arranged along the direction in which the center of the substrate 1 points to the edge, the deformation direction of the annular piezoelectric ceramics 22 adjacent to the center piezoelectric ceramics 21 is opposite to the deformation direction of the center piezoelectric ceramics 21, and the deformation directions of two adjacent annular piezoelectric ceramics 22 are opposite. The composite base material 4 is bonded to the central piezoelectric ceramic 21 and the plurality of annular piezoelectric ceramics 22 by the conductive paste 5.
It should be noted that the center of the substrate 1 may be a geometric center of the substrate 1, and for example, when the substrate 1 is circular, the center of the substrate 1 is a center of the substrate 1. The deformation direction of the central piezoelectric ceramic 21 means that the central piezoelectric ceramic 21 itself has polarity, and under the influence of an external electric field, the central piezoelectric ceramic 21 is deformed, such as being convex along the direction of the electric field; similarly, the deformation direction of the annular piezoelectric ceramic 22 means that the annular piezoelectric ceramic 22 itself has polarity, and under the influence of the applied electric field, the annular piezoelectric ceramic 22 is deformed, such as convex deformation along the direction of the electric field.
The high-frequency performance of the piezoelectric diaphragm mainly depends on the position and the number of high-frequency modes in an audio frequency range (the audio frequency range is not 20-20 kHz), and the higher the frequency of the high-frequency modes is, the better the high-frequency extensibility of the high-frequency modes is; the larger the number of high-frequency modes, the smoother the high-frequency sensitivity. And the frequency and the number of the high-frequency modes are mainly determined by the rigidity and the shape of the piezoelectric diaphragm. Therefore, changing the shape of the piezoelectric diaphragm can increase the number of modes thereof, and this embodiment provides the structure of the piezoelectric diaphragm described above, which can change the high-frequency performance of the piezoelectric diaphragm.
The piezoelectric diaphragm and the piezoelectric loudspeaker provided by the invention have the advantages that the piezoelectric ceramics comprise the central piezoelectric ceramics 21 and the plurality of annular piezoelectric ceramics 22, the deformation direction of the annular piezoelectric ceramics 22 adjacent to the central piezoelectric ceramics 21 is opposite to that of the central piezoelectric ceramics 21, the deformation directions of the two adjacent annular piezoelectric ceramics 22 are opposite, compared with the traditional piezoelectric diaphragm, the acoustic performance of the piezoelectric diaphragm is effectively inhibited, the piezoelectric loudspeaker can have better high-frequency performance, the piezoelectric diaphragm is reflected on a frequency response curve, the frequency response curve in a high-frequency section can be smoother, and no obvious wave crest and wave trough exist. Further, the resonance frequency of the piezoelectric speaker is not affected, and the sensitivity does not change greatly.
Alternatively, there may be a plurality of ways to make the deformation direction of the annular piezoelectric ceramics 22 adjacent to the center piezoelectric ceramics 21 opposite to the deformation direction of the center piezoelectric ceramics 21, and the present embodiment provides the following two ways.
In one way of making the deformation direction of the annular piezoelectric ceramics 22 adjacent to the central piezoelectric ceramics 21 opposite to the deformation direction of the central piezoelectric ceramics 21, the polarization direction of the annular piezoelectric ceramics 22 adjacent to the central piezoelectric ceramics 21 is opposite to the polarization direction of the central piezoelectric ceramics 21, and during the use of the piezoelectric diaphragm, the direction of the electric field applied to the annular piezoelectric ceramics 22 adjacent to the central piezoelectric ceramics 21 is the same as the direction of the electric field applied to the central piezoelectric ceramics 21, so that the deformation direction exhibited by the central piezoelectric ceramics 21 is opposite to the deformation direction exhibited by the annular piezoelectric ceramics 22 adjacent to the central piezoelectric ceramics 21.
In another way of making the deformation direction of the annular piezoelectric ceramics 22 adjacent to the central piezoelectric ceramics 21 opposite to the deformation direction of the central piezoelectric ceramics 21, the polarization direction of the annular piezoelectric ceramics 22 adjacent to the central piezoelectric ceramics 21 is the same as the polarization direction of the central piezoelectric ceramics 21, and during use of the piezoelectric diaphragm, the direction of the electric field applied to the annular piezoelectric ceramics 22 adjacent to the central piezoelectric ceramics 21 is opposite to the direction of the electric field applied to the central piezoelectric ceramics 21.
Similarly, there may be a plurality of ways to reverse the deformation direction of two adjacent annular piezoelectric ceramics 22, and the present embodiment provides the following two ways.
In one way of making the deformation directions of two adjacent annular piezoelectric ceramics 22 opposite, the polarization directions of two adjacent annular piezoelectric ceramics 22 are opposite, and the directions of the electric fields applied to two adjacent annular piezoelectric ceramics 22 during the use of the piezoelectric diaphragm are the same, so that the deformation directions exhibited by two adjacent annular piezoelectric ceramics are opposite.
In another way of making the deformation directions of two adjacent annular piezoelectric ceramics 22 opposite, the polarization directions of two adjacent annular piezoelectric ceramics 22 are the same, and the directions of electric fields applied to two adjacent annular piezoelectric ceramics 22 during the use of the piezoelectric diaphragm are opposite.
Referring to fig. 2, the thickness of the plurality of annular piezoelectric ceramics 22 is the same, and the thickness of the central piezoelectric ceramics 21 is the same as that of the plurality of annular piezoelectric ceramics 22, so as to be installed in the piezoelectric speaker. The thickness direction of the center piezoelectric ceramic 21 (or the annular piezoelectric ceramic 22) is a direction perpendicular to the substrate 1.
Optionally, as shown in fig. 3, in order to avoid mutual influence between adjacent piezoelectric ceramics 21, glue 6 is filled between the central piezoelectric ceramic 21 and the annular piezoelectric ceramic 22, and between two adjacent annular piezoelectric ceramics 22.
In this embodiment, a piezoelectric ceramic 2 is fixed on one side of the substrate 1 (as shown in fig. 2 to 4), or the piezoelectric ceramic 2 is disposed on both the upper and lower sides of the substrate 1 (as shown in fig. 5), so that the piezoelectric diaphragm and the piezoelectric speaker can have a wider application range.
Illustratively, the cross-sectional shape of the center piezoelectric ceramic 21 may be circular, square, triangular, or racetrack, etc. Fig. 6 shows a case where the cross-sectional shape of the center piezoelectric ceramic 21 is square, and fig. 7 shows a case where the cross-sectional shape of the center piezoelectric ceramic 21 is circular. For example, the central piezoelectric ceramic 21 may have a solid structure, or the central piezoelectric ceramic 21 may also have a ring shape, which is not limited in this embodiment.
Further, the cross-sectional shapes of the plurality of annular piezoelectric ceramics 22 may be all circular, square, triangular, or racetrack shapes. When the cross-sectional shape of the central piezoelectric ceramic 21 is circular, the cross-sectional shapes of the annular piezoelectric ceramics 22 are all circular (as shown in fig. 1), so that the central piezoelectric ceramic 21 can be better matched with the annular piezoelectric ceramics 22; when the cross-sectional shape of the central piezoelectric ceramics 21 is square, the cross-sectional shapes of the plurality of annular piezoelectric ceramics 22 are all square (as shown in fig. 8); when the cross-sectional shape of the center piezoelectric ceramics 21 is circular, the cross-sectional shapes of the plurality of annular piezoelectric ceramics 22 are all square (as shown in fig. 9).
Alternatively, as shown in fig. 7, the plurality of annular piezoelectric ceramics 22 includes a first annular piezoelectric ceramic 221 having a circular cross section and a second annular piezoelectric ceramic 222 having a square cross section. Fig. 7 is a schematic view of first annular piezoelectric ceramic 221 adjacent to central piezoelectric ceramic 21.
When the piezoelectric diaphragm shown in fig. 1 and 2 provided in this embodiment is subjected to modal analysis, a modal analysis graph shown in fig. 10 can be obtained, where an abscissa in fig. 10 represents frequency in hertz (Hz), an ordinate in fig. 10 represents sound pressure level in decibel (dB), a solid line in fig. 10 represents a relationship curve between sound pressure level and frequency of the piezoelectric diaphragm in this implementation, and a dotted line in fig. 10 represents a relationship curve between sound pressure level and frequency of the piezoelectric diaphragm in the prior art. As can be seen from fig. 10, in the prior art piezoelectric diaphragm design, one or more division modes often occur at a high frequency (e.g., a frequency of about 10000 Hz), so that peaks and valleys occur in a frequency response curve, which affects the hearing. The piezoelectric diaphragm provided by the embodiment has no segmentation mode at high frequency, and can be relatively smooth, so that the hearing of the piezoelectric loudspeaker with the piezoelectric diaphragm is relatively good.
In addition, fig. 11 shows the case where the voltage is fed back to the ring-shaped piezoelectric ceramics 22 adjacent to the center piezoelectric ceramics 21. The design of the piezoelectric diaphragm can synchronously feed back the sounding condition of the piezoelectric loudspeaker, so that the EQ can be adjusted in real time aiming at products. The specific working principle is the direct piezoelectric effect, as shown in fig. 1, when the central piezoelectric ceramic 21 and the annular piezoelectric ceramic 22 spaced from the central piezoelectric ceramic 21 are energized, they will deform back and forth, so that an external force acts on the annular piezoelectric ceramic 22 adjacent to the central piezoelectric ceramic 21, and the annular piezoelectric ceramic 22 will generate a voltage varying with the frequency, as shown in fig. 5, and feed back the voltage to the circuit to serve as the basis of the real-time EQ frequency response, so that the EQ can be set up in a personalized manner in the true sense.
The embodiment also provides a piezoelectric loudspeaker which comprises the piezoelectric diaphragm.
The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but rather is susceptible to various changes and modifications without departing from the spirit and scope of the invention, which changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A piezoelectric diaphragm, comprising:
a substrate (1);
the piezoelectric ceramics (2) are fixed on the substrate (1) through fixing glue (3), the piezoelectric ceramics (2) comprise a central piezoelectric ceramic (21) and a plurality of annular piezoelectric ceramics (22), the annular piezoelectric ceramics (22) are all annular and are arranged around the central piezoelectric ceramic (21), the annular piezoelectric ceramics (22) are arranged along the direction of the center pointing to the edge of the substrate (1), the deformation direction of the annular piezoelectric ceramics (22) adjacent to the central piezoelectric ceramic (21) is opposite to that of the central piezoelectric ceramic (21), and the deformation directions of two adjacent annular piezoelectric ceramics (22) are opposite;
and the composite base material (4) is bonded to the central piezoelectric ceramic (21) and the annular piezoelectric ceramics (22) through conductive adhesive (5).
2. The piezoelectric diaphragm according to claim 1, wherein the central piezoelectric ceramic (21) and the plurality of annular piezoelectric ceramics (22) have the same thickness.
3. The piezoelectric diaphragm according to claim 1, wherein glue (6) is filled between the central piezoelectric ceramic (21) and the annular piezoelectric ceramic (22), and between two adjacent annular piezoelectric ceramics (22).
4. The piezoelectric diaphragm of claim 1, wherein the cross-sectional shape of the central piezoelectric ceramic (21) is circular, square, triangular or racetrack.
5. The piezoelectric diaphragm according to claim 4, wherein the cross-sectional shapes of the plurality of annular piezoelectric ceramics (22) are all circular, square, triangular or racetrack.
6. The piezoelectric diaphragm according to claim 4, wherein the plurality of annular piezoelectric ceramics (22) includes a first annular piezoelectric ceramic (221) having a circular cross section and a second annular piezoelectric ceramic (222) having a square cross section.
7. The piezoelectric diaphragm according to claim 1, wherein the piezoelectric ceramic (2) is fixed to one side of the substrate (1), or the piezoelectric ceramic (2) is disposed on both upper and lower sides of the substrate (1).
8. The piezoelectric diaphragm according to any one of claims 1 to 7, wherein the polarization direction of the annular piezoelectric ceramic (22) adjacent to the central piezoelectric ceramic (21) is opposite to the polarization direction of the central piezoelectric ceramic (21), and the direction of the electric field applied to the annular piezoelectric ceramic (22) adjacent to the central piezoelectric ceramic (21) is the same as the direction of the electric field applied to the central piezoelectric ceramic (21) during use of the piezoelectric diaphragm; alternatively, the first and second electrodes may be,
the polarization direction of the annular piezoelectric ceramics (22) adjacent to the central piezoelectric ceramics (21) is the same as that of the central piezoelectric ceramics (21), and in the use process of the piezoelectric diaphragm, the direction of an electric field applied to the annular piezoelectric ceramics (22) adjacent to the central piezoelectric ceramics (21) is opposite to that applied to the central piezoelectric ceramics (21).
9. The piezoelectric diaphragm of claim 8, wherein the polarization directions of two adjacent annular piezoelectric ceramics (22) are opposite, and the directions of electric fields applied to two adjacent annular piezoelectric ceramics (22) are the same during the use of the piezoelectric diaphragm; or the polarization directions of two adjacent annular piezoelectric ceramics (22) are the same, and the directions of electric fields applied to the two adjacent annular piezoelectric ceramics (22) are opposite in the use process of the piezoelectric diaphragm.
10. A piezoelectric speaker, comprising the piezoelectric diaphragm according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010618300.1A CN111770421A (en) | 2020-06-30 | 2020-06-30 | Piezoelectric vibrating diaphragm and piezoelectric loudspeaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010618300.1A CN111770421A (en) | 2020-06-30 | 2020-06-30 | Piezoelectric vibrating diaphragm and piezoelectric loudspeaker |
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| CN111770421A true CN111770421A (en) | 2020-10-13 |
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| CN202010618300.1A Pending CN111770421A (en) | 2020-06-30 | 2020-06-30 | Piezoelectric vibrating diaphragm and piezoelectric loudspeaker |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005229227A (en) * | 2004-02-12 | 2005-08-25 | Citizen Watch Co Ltd | Piezoelectric vibrator |
| CN101247674A (en) * | 2008-03-17 | 2008-08-20 | 江苏裕成电子有限公司 | Piezoelectric ceramic electro-acoustic conversion device |
| EP2373057A1 (en) * | 2008-12-26 | 2011-10-05 | Panasonic Electric Works Co., Ltd. | Piezoelectric speaker, piezoelectric audio device employing piezoelectric speaker, and sensor with alert device attached |
-
2020
- 2020-06-30 CN CN202010618300.1A patent/CN111770421A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005229227A (en) * | 2004-02-12 | 2005-08-25 | Citizen Watch Co Ltd | Piezoelectric vibrator |
| CN101247674A (en) * | 2008-03-17 | 2008-08-20 | 江苏裕成电子有限公司 | Piezoelectric ceramic electro-acoustic conversion device |
| EP2373057A1 (en) * | 2008-12-26 | 2011-10-05 | Panasonic Electric Works Co., Ltd. | Piezoelectric speaker, piezoelectric audio device employing piezoelectric speaker, and sensor with alert device attached |
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Inventor after: Wei Pengjiang Inventor after: Yuan Shiming Inventor before: Wei Pengjiang Inventor before: Yuan Shiming Inventor before: Zhang Ruicheng Inventor before: Weng Jiechen |
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Application publication date: 20201013 |